Boat hull



.Nov. 21, 1944. r

Filed Dec. 50 1943 c. A. HUARD 2,363,421

BOAT HULL 2 Sheets-Sheet l Inventor C 1. m2 7 Human Nov. 21, 1944. c. A. HUARD 2,363,421

BOAT HULL Filed Dec. 30, 1943 ,2 SheetS-Sheet-Z 6 g I .Inyentar Curie/7170,0420

- B, 9mm...

I I high speed.

Patented Nov. 21, 1944 U N] TE D STATES PAT ENT -()"F F] CE 2,363,421 Q a BoA'rHULn Clair A. I-Iuard, Detroit, .Mich; Appli cation December 30, le iaserialNo;516,262 4 Claims. (01. 114-cc.5)-

This invention relate s to improvements invhull construction for racing and other boats, and important objects of the inventionv are to provide a hull construction ofthis kind that is compact 'cient primary lifting plane or airfoil'having a broad rounded noseand tapering narrower at the rear, with upper and lower surfaces suitably curved transversely andlongitudinally to afford eflicient lifting action when the boat is driven at The invention further contemplates the provision of a boat hull'of the above character'whose i central rear under surface portion constitutes a rear supporting plane or surface whichaffords the only contact of the body with the water when the boat is traveling at ever high speed, the area of such contact being relatively smallto ensure minimum friction or resistance to forward travel.

Still further,

the present invention contemplates the provision of a boat hull of the charac ter mentionedv above, and wherein the hull, near 1 its forward portion, isprovided in its under surfaceand at opposite sides with longitudinal elongated recesses that accommodate rocking balancing planes mounted upon parallel I axes extending parallel with the longitudinal axis of the boat,'and so designed and mounted as toact'upon the air and/or water when the boat is sharply more fully described, shown in the accompanying drawings and claimed.

In the drawings, whereinlike reference characters indicate corresponding parts throughout the several views: 1 I

Figure '1 .is a bottom plan view of a racing boat constructed in accordance with the present invention.

Figure 2 is a side elevational view thereof; Figure 3 is a front elevational view of the same, and

Figure 4 is a fragmentary longitudinal section taken on the plane of line 44 of Figure 1.

Referring in detail to the drawings, the present boat hull includes a flat-like body 5 whose major portion isso formediand' shaped as to constitute an efiicient primary lifting plane or airfoil having a broad rounded nose end 6 and having its rear portion.taperednarrower, as at I; As will be seen from an inspection of Figures 2 and 3, the upper surface of this lifting plane or airfoil is suitably curved longitudinally and trannsversely, and the major central portion of the lower surface is alto longitudinally curved to afford an efiicient liftingplane or airfoil; Preferably, the primary plane or airfoil tapers thinner toward the front and side edges, as'at 8 and 9 and has a relatively long sloping rear upper surface portion, as at 10.

The body has along'itudinally elongated central rear under-surface portion II that inclines slightly 'in'a rearward directionand constitutes a rear supporting'plane or surface of comparatively small'area; When traveling aheadat very high speed, this is; the only surface of the bodythat partially contacts the surface of the water, therei by ensuring minimum friction or' resistance to forward travel and promoting the attainment of very' high'speeds; 'The body projects rearwardly of the rear supporting plane or surface H where it' is tapered substantiall to apoint, as at 12..

' The body hasa-corhpartme'nt formed in the rear central portion'thereof over which is erected a suitable superstructure lit-adapted to accommodate the pilot an'd'to house thepropeller driving motor and various necessary speed controlling,

ste'itiing andother devices; A'tubular'housing' l4 projects through the bottom of the body centrally between the sides of the rear portion of the latter,

and the drive shaft for the propeller of the boat is adapted tofproject through this' housing, as

upper portions of similar rocking balancing planes '16 mounted upon longitudinal parallel axes at IT parallel with each other and with the longitudinal axis of the body. Each balancing plane it consistsof a hollow elongated member that tapers smaller in a forward direction,,as shown in Figures 2 and 4, and that has a major transversely curvedarcuate surface portion [8 and a V-shaped but nearly fiat remaining surface portion I9. The balancing planes l6 are pivoted in brackets or hangers 20 attached to the body a and depending slightly below the lower surface of said body so that the planes 16 project below said under surface of the body as shown. The pivots 21 of the planes i6 are located adjacent and midway between the sides of the surface portion [9, which is at a point nearer the arcuate surface I8 than the center of the radius of said surface I8. In this way, the planes l6 are disposed so that they will contact the walls of the recesses I to limit rocking movement of said planes to substantially a quarter turn in either direction. In operation at fairly high speed, the balancing planes will be caused -to automatically assume the dotted line position for the right hand plane I8 of Figure 3 when the boat is steered to the right, and the dotted position of the left hand plane it; when the boat is steered to the left. Thus, flat surfaces are automatically presented to the wind or water for minimizing side slip when making turns, thereby facilitating short turns at such fairly high speed with comparative safety. Of course, when the boat is traveling at a very high speed, the balancing planes will be entirely out of the water and will be frictionally maintained in their full line position of Figure 3 by the pivots thereof. When lying on the Water, the planes I6 naturally assume the full line positions of Figure 3.

From the foregoing description, it is believed that the behavior and functioning, of the various features and elements will be readily apparent. It will be seen that I have provided a very compact and durable boat hull of the kind specified having provision for effectively carrying out the stated objects of the invention. Minor changes in form of parts and details of construction are contemplated, such as fairly fall within the spirit and scope of the invention as claimed.

What I claim as new is:

l. A boat hull comprising a very flat and broad elongated body whose major forward portion is, formed and shaped to afford a primary lifting plane or airfoil having a comparatively blunt and board rounded nose end and an upper surface which curves upwardly longitudinally and transversely and whose major central under surface portion is flat transversely and curves forwardly and upwardly at the forward end, the rear central under surface portion of the body affording an elongated rear supporting plane or surface inclined rearwardly, the rear portion of the primarylifting plane tapering narrower in a rearward direction and merging with the rear end of the body, said rear end of the body being tapered substantially to a point, the under surfaces of the portions of the body at opposite sides of said central under surface portions being inclined out wardly and upwardly.

2. A boat hull comprising a flat-like elongated body whose major forward portion is formed and shaped to afford a primary lifting plane or airfoil having a broad rounded nose end and an upper surface which curves upwardly longitudinally and transversely and whose major central under surface portion curves forwardly and upwardly at the forward end, the rear central under surface portion of the body affording an elongated rear supporting plane or surface inclined rearwardly, the rear portion of the primary lifting plane tapering narrower in a rearward direction and merging with the rear end of the body, said 'rear end of the body being tapered substantially to a point, said body being provided in its under surface at opposite sides and near its forward end with longitudinal elongated re cesses, and rocking balancing planes pivoted to the under side of the body and partially accommodated in said recesses, means pivotally mounting said balancing planes upon longitudinal axes parallel with the longitudinal axis of the boat so as to have limited rocking motion in either direction.

3. A boat hull comprising a fiat-like elongated body whose major forward portion is formed and shaped to afford a primary lifting plane or airfoil having a broad rounded nose end and an upper surface which curves upwardly longitudinally and transversely and whose major central under surface portion curves forwardly and upwardly at the forward end, the rear central under surface portion of the body affording an elongated rear supporting plane or surface inclined rearwardly, the rear portion of the primary lifting plane tapering narrower in a rearward direction and merging with the rear end of the body,

said rear end of the body being tapered substantially to a point, said body being provided in its under surface at opposite sides and near its forward end with longitudinal elongated recesses, and rocking balancing planes pivoted to the under side of the body and partially accommodated in said recesses, means pivotally mounting said balancing planes upon longitudinal axes parallel with the longitudinal axis of the boat so as to have limited rocking motion in either'direction, each balancing plane having a major substantially semi-cylindrical surface portion and a remaining surface portion of V shape but nearly flat form.

4. A boat hull comprising a flat-like'elongated body whose major forward portion is formed and shaped to afford a primary lifting plane or airfoil having a broad rounded nose end and an upper surface which curves upwardly longitudinally and transversely and whose major central under surface portion curves forwardly and upwardly at the forward end, the rear central under surface portion of the body affording an elongated rear supportingplane or surface inclined rearwardly, the rear portion of the primary lifting plane tapering narrower in a rearward direction and merging with the rear end of the body, said rear end of the body being tapered substantially to a point, said body being provided in its under surface at opposite sides and near its forward end with longitudinal elongated recesses, and rocking balancing planes pivoted to the under side of the body and partially accommodated in said recesses, means pivotally mounting said balancing planes upon longitudinal axes parallel, with the longitudinal axis of the boat so as to] have limited rocking motion in either direction} each balancing plane having a major substantially semi-cylindrical surface portion and a remaining surface portion 'of V shape but nearly flat form, the pivots of the balancing planes being located nearer to the semi-cylindrical surfaces thereof than the axes of said surfaces so that the planes coact with the recess walls to limit the rocking movement.

CLAIR A. HUARD. 

